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A German-made reciprocating triplex plunger pump.

Spheroidal cast iron crankcase with sight glass and vented dipstick; forged, through-hardened, ground and polished crankshaft; bronze connecting rods; hardened stainless steel plunger bases; solid ceramic plungers; nitrile seals with fabric reinforcing; stainless steel valves and machined stainless steel manifold.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to

Specification US Metric
Flow15.9 GPM60 L/min
Maximum Discharge Pressure4060 PSI280 bar
Crankshaft Speed1100 RPM
Power44.5 HP33.2 KW
Max Temperature140 °F60 °C
Inlet Port Size1" BSP
Discharge Port Size3/4" BSP
Plunger Diameter0.95 in.24 mm
Stroke1.65 in.42 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter1.38 in.35 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US0.8 gal 3.0 L
Weight125 lbs.56.5 kg
Manifold Material Stainless Steel
Crankcase Material Spheroidal Cast Iron
Plunger Material Solid Ceramic Oxide
Valve Material Stainless Steel
Seal Material Nitrile with Fabric Reinforcing
The repair kits listed to the right are available for this pump. If you need further information about these repair kits, or have questions about other specific parts for your pump, please contact you local Giant distributor or contact Giant customer service.
Plunger Packing Kit – Part #09789
36 13238 Leakage Seal 3
38 12055 O-Ring 6
39 07693 Support Ring 6
40 06083 V-Sleeve 6
Valve Assembly Kit – Part #09792
38 12055 O-Ring 6
39 07693 Support Ring 6
48B 05972 O-Ring 3
51 04513 Valve Assembly 6
Oil Seal Kit – Part #09577
31 07133 Oil Seal 3

Horsepower Specifications

RPM GPM 2500 PSI 3000 PSI 3500 PSI 4060 PSI
550 8.0 13.8 16.6 19.3 22.4
600 8.7 15.0 18.0 21.0 24.4
700 10.1 17.4 20.9 24.4 28.3
800 11.6 20.0 24.0 28.0 32.5
900 13.0 22.4 26.9 31.4 36.4
1100 15.9 27.4 32.9 38.4 44.5

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • LP305 Exploded View
  • LP305 Parts List


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • LP305 Installation Instructions
  • LP305 Repair Instructions
  • Troubleshooting Guide

Sample Pump

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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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